Article-Writing Your Own Widget/Writing Your Own Widget_files/AppendixD.htm - www.eclipse.org/articles - Git at Google

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 <title>Appendix D: Spinner for Motif</title>
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 <h2>Appendix D: Spinner for Motif</h2>
 This appendix contains the source code for the Motif version of the <i>Spinner</i> natives in spinner.c, and the shell file and makefile for building the Motif Shared Object Library
 libspinner.so.
 <h3><strong>spinner.c</strong></h3>
 <pre>
 /*
  * (c) Copyright IBM Corp. 2000, 2001.
  * All Rights Reserved.
  */

 #include &lt;jni.h&gt;
 #include &lt;Xm/XmAll.h&gt;
 #include &lt;pthread.h&gt;
 #include &lt;stdio.h&gt;

 #define ARROW_WIDTH 19
 #define SPACING 2

 static jobject javaClass;
 static jmethodID mid;
 static pthread_key_t envKey;

 int Callback(Widget handle, XtPointer clientData, XmAnyCallbackStruct * callData) {
     JNIEnv *env = (JNIEnv *) pthread_getspecific(envKey);
     if (env != NULL) {
         /* If an exception has already occurred,
          * allow the stack to unwind so that the
          * exception will be thrown in Java. */
         if ((*env)-&gt;ExceptionOccurred(env)) return 0;
         switch (callData-&gt;reason) {
             //case XmCR_SPIN_NEXT:
             //case XmCR_SPIN_PRIOR:
             case XmCR_OK:
                 ((*env)-&gt;CallStaticVoidMethod(env, javaClass, mid, handle));
                 return 0;
         }
     }
     return 0;
 }

 /*
  * Class:     spinner_Spinner
  * Method:    createControl
  * Signature: (I)I
  */
 JNIEXPORT jint JNICALL Java_spinner_Spinner_createControl
     (JNIEnv *env, jclass that, jint handleParent)
 {
     Widget handleSpinBox;
     Arg argList[10];
     int n = 0;
     XtSetArg(argList[n], XmNspinBoxChildType, XmNUMERIC); n++;
     XtSetArg(argList[n], XmNarrowLayout, XmARROWS_END); n++;
     handleSpinBox = XmCreateSimpleSpinBox((Widget) handleParent, NULL, argList, n);
     if (handleSpinBox == 0) return 0;
     XtManageChild(handleSpinBox);
     XtAddCallback(handleSpinBox, XmNvalueChangedCallback, (XtCallbackProc) Callback, NULL);
     if (javaClass == 0) {
         javaClass = (*env)-&gt;NewGlobalRef(env, (jobject) that);
         mid = (*env)-&gt;GetStaticMethodID(env, (jobject) that, &quot;widgetSelected&quot;, &quot;(I)V&quot;);
         pthread_key_create(&amp;envKey, NULL);
     }
     pthread_setspecific(envKey, env);
     return (jint) handleSpinBox;
 }

 /*
  * Class:     spinner_Spinner
  * Method:    computeSize
  * Signature: (I[I)V
  */
 JNIEXPORT void JNICALL Java_spinner_Spinner_computeSize
     (JNIEnv *env, jclass that, jint handleSpinBox, jintArray result)
 {
     Dimension width, height;
     Arg argList[10];
     int n;
     Widget handleText;
     XmFontList fontList;
     Dimension sbShadowThickness, textMarginWidth, textMarginHeight, textShadowThickness;
     int max, digits;
     char text [64];
     XmString xmString;

     jint *result1 = NULL;
     result1 = (*env)-&gt;GetIntArrayElements(env, result, NULL);

     n = 0;
     XtSetArg(argList[n], XmNtextField, &amp;handleText); n++;
     XtSetArg(argList[n], XmNmaximumValue, &amp;max); n++;
     XtSetArg(argList[n], XmNshadowThickness, &amp;sbShadowThickness); n++;
     XtGetValues((Widget) handleSpinBox, argList, n);

     n = 0;
     XtSetArg(argList[n], XmNfontList, &amp;fontList);  n++;
     XtSetArg(argList[n], XmNmarginWidth, &amp;textMarginWidth); n++;
     XtSetArg(argList[n], XmNmarginHeight, &amp;textMarginHeight); n++;
     XtSetArg(argList[n], XmNshadowThickness, &amp;textShadowThickness); n++;
     XtGetValues(handleText, argList, n);

     if (max &gt; 0) {
         digits = 0;
         while (max &gt; 0) {
             text[digits] = '0';
             max /= 10;
             digits++;
         }
         text [digits] = 0;
         xmString = XmStringParseText(
             (XtPointer) text,
             (XtPointer *) NULL,
             XmFONTLIST_DEFAULT_TAG,
             XmCHARSET_TEXT,
             (XmParseTable) NULL,
             0,
             (XtPointer) 0);
         width = XmStringWidth(fontList, xmString);
         height = XmStringHeight(fontList, xmString);
         XmStringFree(xmString);
     } else {
         width = 200;
         height = 50;
     }

     // Add in the margins.
     width += textMarginWidth * 2 + textShadowThickness * 2 + sbShadowThickness * 2 + ARROW_WIDTH + SPACING;
     height += textMarginHeight * 2 + textShadowThickness * 2 + sbShadowThickness * 2;
     result1 [0] = width;
     result1 [1] = height;
     (*env)-&gt;ReleaseIntArrayElements(env, result, result1, 0);
 }

 /*
  * Class:     spinner_Spinner
  * Method:    resizeControl
  * Signature: (IIIII)V
  */
 JNIEXPORT void JNICALL Java_spinner_Spinner_resizeControl
     (JNIEnv *env, jclass that, jint handleSpinBox, jint x, jint y, jint width, jint height)
 {
     Arg arg;
     Widget handleText;
     XtSetArg(arg, XmNtextField, &amp;handleText);
     XtGetValues((Widget) handleSpinBox, &amp;arg, 1);
     XtResizeWidget((Widget) handleSpinBox, width, height, 0);
     XtResizeWidget(handleText, width - ARROW_WIDTH, height, 0);
 }

 /*
  * Class:     spinner_Spinner
  * Method:    setPosition
  * Signature: (II)V
  */
 JNIEXPORT void JNICALL Java_spinner_Spinner_setPosition
     (JNIEnv *env, jclass that, jint handle, jint position)
 {
     Arg arg;
     XtSetArg(arg, XmNposition, position);
     XtSetValues((Widget) handle, &amp;arg, 1);
 }

 /*
  * Class:     spinner_Spinner
  * Method:    getPosition
  * Signature: (I)I
  */
 JNIEXPORT jint JNICALL Java_spinner_Spinner_getPosition
     (JNIEnv *env, jclass that, jint handle)
 {
     Arg arg;
     int pos;
     XtSetArg(arg, XmNposition, &amp;pos);
     XtGetValues((Widget) handle, &amp;arg, 1);
     return (jint) pos;
 }

 /*
  * Class:     spinner_Spinner
  * Method:    setMaximum
  * Signature: (II)V
  */
 JNIEXPORT void JNICALL Java_spinner_Spinner_setMaximum
     (JNIEnv *env, jclass that, jint handle, jint max)
 {
     Arg arg;
     XtSetArg(arg, XmNmaximumValue, max);
     XtSetValues((Widget) handle, &amp;arg, 1);
 }

 /*
  * Class:     spinner_Spinner
  * Method:    getMaximum
  * Signature: (I)I
  */
 JNIEXPORT jint JNICALL Java_spinner_Spinner_getMaximum
     (JNIEnv *env, jclass that, jint handle)
 {
     Arg arg;
     int max;
     XtSetArg(arg, XmNmaximumValue, &amp;max);
     XtGetValues((Widget) handle, &amp;arg, 1);
     return (jint) max;
 }

 /*
  * Class:     spinner_Spinner
  * Method:    setMinimum
  * Signature: (II)V
  */
 JNIEXPORT void JNICALL Java_spinner_Spinner_setMinimum
     (JNIEnv *env, jclass that, jint handle, jint min)
 {
     Arg arg;
     XtSetArg(arg, XmNminimumValue, min);
     XtSetValues((Widget) handle, &amp;arg, 1);
 }

 /*
  * Class:     spinner_Spinner
  * Method:    getMinimum
  * Signature: (I)I
  */
 JNIEXPORT jint JNICALL Java_spinner_Spinner_getMinimum
     (JNIEnv *env, jclass that, jint handle)
 {
     Arg arg;
     int min;
     XtSetArg(arg, XmNminimumValue, &amp;min);
     XtGetValues((Widget) handle, &amp;arg, 1);
     return (jint) min;
 }

 /*
  * Class:     spinner_Spinner
  * Method:    setFont
  * Signature: (II)V
  */
 JNIEXPORT void JNICALL Java_spinner_Spinner_setFont
     (JNIEnv *env, jclass that, jint handle, jint fontList)
 {
     Arg arg;
     Widget handleText;
     XtSetArg(arg, XmNtextField, &amp;handleText);
     XtGetValues((Widget) handle, &amp;arg, 1);
     XtSetArg(arg, XmNfontList, (XmFontList) fontList);
     XtSetValues(handleText, &amp;arg, 1);
 }

 /*
  * Class:     spinner_Spinner
  * Method:    setFocus
  * Signature: (I)V
  */
 JNIEXPORT void JNICALL Java_spinner_Spinner_setFocus
     (JNIEnv *env, jclass that, jint handle)
 {
     Arg arg;
     Widget handleText;
     XtSetArg(arg, XmNtextField, &amp;handleText);
     XtGetValues((Widget) handle, &amp;arg, 1);
     XSetInputFocus(XtDisplay(handleText), XtWindow(handleText), RevertToParent, CurrentTime);
 }
 </pre>
 <p>
 <h3><strong>build.csh</strong></h3>
 <pre>
 #!/bin/csh

 setenv IVE_HOME /bluebird/teamswt/swt-builddir/ive/bin
 setenv MOTIF_HOME /bluebird/teamswt/swt-builddir/motif21
 setenv X_HOME /usr/X11R6
 set path=($IVE_HOME $path)
 setenv LD_LIBRARY_PATH .:$IVE_HOME

 make -f makefile.mak</pre>
 <p>
 <h3><strong>makefile.mak</strong></h3>
 <pre>
 # Makefile for module 'libspinner.so'
 # assumes IVE_HOME, MOTIF_HOME, and X_HOME are set in the environment

 # NOTE:
 # We use the VPATH directive to allow the generic UNIX source files to be
 # located in a single directory. IX make does not understand VPATH so
 # you must use a 'make' which does understand it (like LINUX make)
 VPATH= ../:../../common

 DLLPREFIX=spinner
 DLLNAME=lib$(DLLPREFIX).so

 CFLAGS=-fpic -O -s -DLINUX -DMOTIF -I./ -I../ -I$(IVE_HOME)/include -I$(MOTIF_HOME)/include -I$(X_HOME)/include
 LFLAGS=-L$(MOTIF_HOME)/lib -lXm -L/usr/lib -L/usr/X11R6/lib -rpath . -x -shared -lX11 -lm -lXext -lXt
 OBJS = spinner.o

 all: $(DLLNAME)

 $(DLLNAME): $(OBJS)
 	 ld $(LFLAGS) -o $(DLLNAME) $(OBJS)

 clean:
 	 rm -f *.o
 	 rm -f $(DLLNAME)
 </pre>
 </body>

 </html>
	<html>

	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
	<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
	<meta name="ProgId" content="FrontPage.Editor.Document">
	<meta name="Author" content="Carolyn MacLeod">
	<title>Appendix D: Spinner for Motif</title>
	</head>

	<body>
	<h2>Appendix D: Spinner for Motif</h2>
	This appendix contains the source code for the Motif version of the <i>Spinner</i> natives in spinner.c, and the shell file and makefile for building the Motif Shared Object Library
	libspinner.so.
	<h3><strong>spinner.c</strong></h3>
	<pre>
	/*
	* (c) Copyright IBM Corp. 2000, 2001.
	* All Rights Reserved.
	*/

	#include <jni.h>
	#include <Xm/XmAll.h>
	#include <pthread.h>
	#include <stdio.h>

	#define ARROW_WIDTH 19
	#define SPACING 2

	static jobject javaClass;
	static jmethodID mid;
	static pthread_key_t envKey;

	int Callback(Widget handle, XtPointer clientData, XmAnyCallbackStruct * callData) {
	JNIEnv env = (JNIEnv ) pthread_getspecific(envKey);
	if (env != NULL) {
	/* If an exception has already occurred,
	* allow the stack to unwind so that the
	* exception will be thrown in Java. */
	if ((*env)->ExceptionOccurred(env)) return 0;
	switch (callData->reason) {
	//case XmCR_SPIN_NEXT:
	//case XmCR_SPIN_PRIOR:
	case XmCR_OK:
	((*env)->CallStaticVoidMethod(env, javaClass, mid, handle));
	return 0;
	}
	}
	return 0;
	}

	/*
	* Class: spinner_Spinner
	* Method: createControl
	* Signature: (I)I
	*/
	JNIEXPORT jint JNICALL Java_spinner_Spinner_createControl
	(JNIEnv *env, jclass that, jint handleParent)
	{
	Widget handleSpinBox;
	Arg argList[10];
	int n = 0;
	XtSetArg(argList[n], XmNspinBoxChildType, XmNUMERIC); n++;
	XtSetArg(argList[n], XmNarrowLayout, XmARROWS_END); n++;
	handleSpinBox = XmCreateSimpleSpinBox((Widget) handleParent, NULL, argList, n);
	if (handleSpinBox == 0) return 0;
	XtManageChild(handleSpinBox);
	XtAddCallback(handleSpinBox, XmNvalueChangedCallback, (XtCallbackProc) Callback, NULL);
	if (javaClass == 0) {
	javaClass = (*env)->NewGlobalRef(env, (jobject) that);
	mid = (*env)->GetStaticMethodID(env, (jobject) that, "widgetSelected", "(I)V");
	pthread_key_create(&envKey, NULL);
	}
	pthread_setspecific(envKey, env);
	return (jint) handleSpinBox;
	}

	/*
	* Class: spinner_Spinner
	* Method: computeSize
	* Signature: (I[I)V
	*/
	JNIEXPORT void JNICALL Java_spinner_Spinner_computeSize
	(JNIEnv *env, jclass that, jint handleSpinBox, jintArray result)
	{
	Dimension width, height;
	Arg argList[10];
	int n;
	Widget handleText;
	XmFontList fontList;
	Dimension sbShadowThickness, textMarginWidth, textMarginHeight, textShadowThickness;
	int max, digits;
	char text [64];
	XmString xmString;

	jint *result1 = NULL;
	result1 = (*env)->GetIntArrayElements(env, result, NULL);

	n = 0;
	XtSetArg(argList[n], XmNtextField, &handleText); n++;
	XtSetArg(argList[n], XmNmaximumValue, &max); n++;
	XtSetArg(argList[n], XmNshadowThickness, &sbShadowThickness); n++;
	XtGetValues((Widget) handleSpinBox, argList, n);

	n = 0;
	XtSetArg(argList[n], XmNfontList, &fontList); n++;
	XtSetArg(argList[n], XmNmarginWidth, &textMarginWidth); n++;
	XtSetArg(argList[n], XmNmarginHeight, &textMarginHeight); n++;
	XtSetArg(argList[n], XmNshadowThickness, &textShadowThickness); n++;
	XtGetValues(handleText, argList, n);

	if (max > 0) {
	digits = 0;
	while (max > 0) {
	text[digits] = '0';
	max /= 10;
	digits++;
	}
	text [digits] = 0;
	xmString = XmStringParseText(
	(XtPointer) text,
	(XtPointer *) NULL,
	XmFONTLIST_DEFAULT_TAG,
	XmCHARSET_TEXT,
	(XmParseTable) NULL,
	0,
	(XtPointer) 0);
	width = XmStringWidth(fontList, xmString);
	height = XmStringHeight(fontList, xmString);
	XmStringFree(xmString);
	} else {
	width = 200;
	height = 50;
	}

	// Add in the margins.
	width += textMarginWidth * 2 + textShadowThickness * 2 + sbShadowThickness * 2 + ARROW_WIDTH + SPACING;
	height += textMarginHeight * 2 + textShadowThickness * 2 + sbShadowThickness * 2;
	result1 [0] = width;
	result1 [1] = height;
	(*env)->ReleaseIntArrayElements(env, result, result1, 0);
	}

	/*
	* Class: spinner_Spinner
	* Method: resizeControl
	* Signature: (IIIII)V
	*/
	JNIEXPORT void JNICALL Java_spinner_Spinner_resizeControl
	(JNIEnv *env, jclass that, jint handleSpinBox, jint x, jint y, jint width, jint height)
	{
	Arg arg;
	Widget handleText;
	XtSetArg(arg, XmNtextField, &handleText);
	XtGetValues((Widget) handleSpinBox, &arg, 1);
	XtResizeWidget((Widget) handleSpinBox, width, height, 0);
	XtResizeWidget(handleText, width - ARROW_WIDTH, height, 0);
	}

	/*
	* Class: spinner_Spinner
	* Method: setPosition
	* Signature: (II)V
	*/
	JNIEXPORT void JNICALL Java_spinner_Spinner_setPosition
	(JNIEnv *env, jclass that, jint handle, jint position)
	{
	Arg arg;
	XtSetArg(arg, XmNposition, position);
	XtSetValues((Widget) handle, &arg, 1);
	}

	/*
	* Class: spinner_Spinner
	* Method: getPosition
	* Signature: (I)I
	*/
	JNIEXPORT jint JNICALL Java_spinner_Spinner_getPosition
	(JNIEnv *env, jclass that, jint handle)
	{
	Arg arg;
	int pos;
	XtSetArg(arg, XmNposition, &pos);
	XtGetValues((Widget) handle, &arg, 1);
	return (jint) pos;
	}

	/*
	* Class: spinner_Spinner
	* Method: setMaximum
	* Signature: (II)V
	*/
	JNIEXPORT void JNICALL Java_spinner_Spinner_setMaximum
	(JNIEnv *env, jclass that, jint handle, jint max)
	{
	Arg arg;
	XtSetArg(arg, XmNmaximumValue, max);
	XtSetValues((Widget) handle, &arg, 1);
	}

	/*
	* Class: spinner_Spinner
	* Method: getMaximum
	* Signature: (I)I
	*/
	JNIEXPORT jint JNICALL Java_spinner_Spinner_getMaximum
	(JNIEnv *env, jclass that, jint handle)
	{
	Arg arg;
	int max;
	XtSetArg(arg, XmNmaximumValue, &max);
	XtGetValues((Widget) handle, &arg, 1);
	return (jint) max;
	}

	/*
	* Class: spinner_Spinner
	* Method: setMinimum
	* Signature: (II)V
	*/
	JNIEXPORT void JNICALL Java_spinner_Spinner_setMinimum
	(JNIEnv *env, jclass that, jint handle, jint min)
	{
	Arg arg;
	XtSetArg(arg, XmNminimumValue, min);
	XtSetValues((Widget) handle, &arg, 1);
	}

	/*
	* Class: spinner_Spinner
	* Method: getMinimum
	* Signature: (I)I
	*/
	JNIEXPORT jint JNICALL Java_spinner_Spinner_getMinimum
	(JNIEnv *env, jclass that, jint handle)
	{
	Arg arg;
	int min;
	XtSetArg(arg, XmNminimumValue, &min);
	XtGetValues((Widget) handle, &arg, 1);
	return (jint) min;
	}

	/*
	* Class: spinner_Spinner
	* Method: setFont
	* Signature: (II)V
	*/
	JNIEXPORT void JNICALL Java_spinner_Spinner_setFont
	(JNIEnv *env, jclass that, jint handle, jint fontList)
	{
	Arg arg;
	Widget handleText;
	XtSetArg(arg, XmNtextField, &handleText);
	XtGetValues((Widget) handle, &arg, 1);
	XtSetArg(arg, XmNfontList, (XmFontList) fontList);
	XtSetValues(handleText, &arg, 1);
	}

	/*
	* Class: spinner_Spinner
	* Method: setFocus
	* Signature: (I)V
	*/
	JNIEXPORT void JNICALL Java_spinner_Spinner_setFocus
	(JNIEnv *env, jclass that, jint handle)
	{
	Arg arg;
	Widget handleText;
	XtSetArg(arg, XmNtextField, &handleText);
	XtGetValues((Widget) handle, &arg, 1);
	XSetInputFocus(XtDisplay(handleText), XtWindow(handleText), RevertToParent, CurrentTime);
	}
	</pre>
	<p>
	<h3><strong>build.csh</strong></h3>
	<pre>
	#!/bin/csh

	setenv IVE_HOME /bluebird/teamswt/swt-builddir/ive/bin
	setenv MOTIF_HOME /bluebird/teamswt/swt-builddir/motif21
	setenv X_HOME /usr/X11R6
	set path=($IVE_HOME $path)
	setenv LD_LIBRARY_PATH .:$IVE_HOME

	make -f makefile.mak</pre>
	<p>
	<h3><strong>makefile.mak</strong></h3>
	<pre>
	# Makefile for module 'libspinner.so'
	# assumes IVE_HOME, MOTIF_HOME, and X_HOME are set in the environment

	# NOTE:
	# We use the VPATH directive to allow the generic UNIX source files to be
	# located in a single directory. IX make does not understand VPATH so
	# you must use a 'make' which does understand it (like LINUX make)
	VPATH= ../:../../common

	DLLPREFIX=spinner
	DLLNAME=lib$(DLLPREFIX).so

	CFLAGS=-fpic -O -s -DLINUX -DMOTIF -I./ -I../ -I$(IVE_HOME)/include -I$(MOTIF_HOME)/include -I$(X_HOME)/include
	LFLAGS=-L$(MOTIF_HOME)/lib -lXm -L/usr/lib -L/usr/X11R6/lib -rpath . -x -shared -lX11 -lm -lXext -lXt
	OBJS = spinner.o

	all: $(DLLNAME)

	$(DLLNAME): $(OBJS)
	ld $(LFLAGS) -o $(DLLNAME) $(OBJS)

	clean:
	rm -f *.o
	rm -f $(DLLNAME)
	</pre>
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